If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
Thermal Resistance
θ
JC
(LLP)
θ
JA
(LLP)
12˚C/W
63˚C/W
6.0V
−65˚C to +150˚C
−0.3V to V
DD
+0.3V
Internally Limited
2000V
200V
150˚C
See AN-1112 "microSMD Wafers Level Chip Scale
Package."
See AN-1187 "Leadless
Leadframe Package (LLP)."
Operating Ratings
Temperature Range
T
MIN
≤
T
A
≤
T
MAX
Supply Voltage
−40˚C
≤
T
A
≤
85˚C
2.2V
≤
V
DD
≤
5.5V
Electrical Characteristics V
DD
= 5V
(Notes 1, 2, 8)
The following specifications apply for V
DD
= 5V, A
V
= 1, and 8Ω load unless otherwise specified. Limits apply for T
A
= 25˚C.
LM4894
Symbol
I
DD
I
SD
P
o
Parameter
Quiescent Power Supply Current
Shutdown Current
Output Power
Conditions
V
IN
= 0V, I
o
= 0A
V
shutdown
= GND
THD = 1% (max); f = 1 kHz
LM4894LD, R
L
= 4Ω (Note 11)
LM4894, R
L
= 8Ω
THD+N
PSRR
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
P
o
= 0.4 Wrms; f = 1kHz
V
ripple
= 200mV sine p-p
f = 217Hz (Note 9)
f = 1kHz (Note 9)
f = 217Hz (Note 10)
f = 1kHz (Note 10)
CMRR
Common_Mode Rejection Ratio
f = 217Hz
87
83
83
80
50
dB
63
dB (min)
1.4
1
0.1
0.850
%
W (min)
Typical
(Note 6)
4
0.1
Limit
(Note 7)
8
1
Units
(Limits)
mA (max)
µA (max)
Electrical Characteristics V
DD
= 3V
The following specifications apply for V
DD
(Notes 1, 2, 8)
= 3V, A
V
= 1, and 8Ω load unless otherwise specified. Limits apply for T
A
= 25˚C.
LM4894
Units
(Limits)
mA (max)
µA (max)
W
%
dB
Symbol
I
DD
I
SD
P
o
THD+N
PSRR
Parameter
Quiescent Power Supply Current
Shutdown Current
Output Power
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Conditions
V
IN
= 0V, I
o
= 0A
V
shutdown
= GND
THD = 1% (max); f = 1kHz
P
o
= 0.25Wrms; f = 1kHz
V
ripple
= 200mV sine p-p
f = 217Hz (Note 9)
f = 1kHz (Note 9)
f = 217Hz (Note 10)
f = 1kHz (Note 10)
Typical
(Note 6)
3.5
0.1
0.35
0.325
87
83
80
78
49
Limit
(Note 7)
6
1
CMRR
Common-Mode Rejection Ratio
f = 217Hz
dB
3
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LM4894
Electrical Characteristics V
DD
= 3V
(Notes 1, 2, 8)
The following specifications apply for V
DD
= 3V, A
V
= 1, and 8Ω load unless otherwise specified. Limits apply for T
A
=
25˚C. (Continued)
Note 1:
All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2:
Absolute Maximum Ratings
indicate limits beyond which damage to the device may occur.
Operating Ratings
indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Electrical Characteristics
state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
θ
JA
, and the ambient temperature T
A
. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
–T
A
)/θ
JA
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4894, see power derating
currents for additional information.
Note 4:
Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5:
Machine Model, 220pF–240pF discharged through all pins.
Note 6:
Typicals are measured at 25˚C and represent the parametric norm.
Note 7:
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 8:
For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I
SD
by a maximum of 2µA.
Note 9:
Unterminated input.
Note 10:
10Ω terminated input.
Note 11:
When driving 4Ω loads from a 5V supply, the LM4894LD must be mounted to a circuit board.
External Components Description
(Figure
1)
Components
1.
2.
3.
4.
R
i
R
f
C
S
C
B
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
.
Feedback resistance which sets the closed-loop gain in conjunction with R
i
.
Supply bypass capacitor which provides power supply filtering. Refer to the
Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section,
Proper Selection of External
Components,
for information concerning proper placement and selection of C
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